For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningRemoval Procedure
Warning: Refer to Approved Equipment for Collision Repair Warning in the
Preface section.
Warning: Refer to Collision Sectioning Warning in the Preface section.
Warning: Refer to Glass and Sheet Metal Handling Warning in the Preface section.
Disable the SIR System. Refer to SIR Dis ...
Installation Procedure
Clean and prepare the attaching surfaces for welding.
Apply structural adhesive to the attaching surfaces.
Position the body rear end panel on the vehicle.
Verify the fit of the body rear end panel.
Clamp the body rear end panel into position.
Spot weld accordingly as no ...
Side Blind Zone Alert (SBZA)
The vehicle may have a Side Blind Zone Alert (SBZA) system. Read this entire
section before using the system.
WARNING
SBZA does not detect vehicles rapidly approaching outside of the side blind
zones, pedestrians, bicyclists, or animals. Failure to use proper care when changing
lanes may res ...